main(List<String> args) {
  // switch判断
  // 比较类型：num String 编译器常量 对象 枚举
  // continue跳转

  String lang = 'Java';

  switch (lang) {
    case 'Dart':
      print('Dart is my favorite');
      break;
    case 'Java':
      print('Java is my favorite');
      continue D;
    // break;
    D:
    case 'Python':
      print('Python is my favorite');
      break;
    default:
      print('None');
  }
}
